Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Reexamination Certificate
2006-04-04
2006-04-04
Sergent, Rabon (Department: 1711)
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
C560S336000, C564S038000
Reexamination Certificate
active
07022874
ABSTRACT:
A process for the preparation of polyisocyanates which contain one or more biuret groups, by reactinga) an aliphatic or cycloaliphatic isocyanate containing two or more isocyanate groups (isocyanate a) withb) a tertiary alcohol or a mixture of water and a tertiary alcohol (biuretizing agent b)at from 100 to 250° C., which comprises carrying out the reaction in the presencec) of a stabilizer (c) which constitutes a catalytic amount of urea, ammonia, biuret, a urea derivative of the formula Iin which R1, R2, R3and R4are hydrogen, C1to C10alkyl or C5to C10aryl, ora carboxamide of the formula IIin which R5is C1to C12alkyl which is unsubstituted or in which 1, 2 or 3 hydrogen atoms are replaced by a radical
REFERENCES:
patent: 3124605 (1964-03-01), Wagner
patent: 3358010 (1967-12-01), Britain
patent: 3367956 (1968-02-01), Hennig et al.
patent: 3903127 (1975-09-01), Wagner et al.
patent: 3976622 (1976-08-01), Wagner et al.
patent: 4028392 (1977-06-01), Ogawa et al.
patent: 4051165 (1977-09-01), Wagner et al.
patent: 4062833 (1977-12-01), Van Eyck et al.
patent: 4127599 (1978-11-01), Mohring et al.
patent: 4147714 (1979-04-01), Hetzel et al.
patent: 4152350 (1979-05-01), Mohring et al.
patent: 4181782 (1980-01-01), Mohring et al.
patent: 4192936 (1980-03-01), Mohring et al.
patent: 1 101 394 (1958-04-01), None
patent: 12 27 004 (1966-10-01), None
patent: 1 543 178 (1969-07-01), None
patent: 19 31 055 (1970-12-01), None
patent: 1 375 463 (1964-09-01), None
patent: 1 475 617 (1967-02-01), None
Journal Fur Praktische Chemie Chemiker-Zeitung, cf. H.J. LAAS, et al., vol. 336 (1994) 185-200.
Bruchmann Bernd
Heider Wolfgang
Jähme Joachim
Langer Werner
Renz Hans
BASF - Aktiengesellschaft
Sergent Rabon
LandOfFree
Preparation of biuret-containing polyisocyanates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preparation of biuret-containing polyisocyanates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of biuret-containing polyisocyanates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3527522